perf(terminal): render only dirty frames by omarluq · Pull Request #351 · omarluq/librecode

omarluq · 2026-09-13T04:07:27Z

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coderabbitai · 2026-09-13T04:07:44Z

No actionable comments were generated in the recent review. 🎉

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📥 Commits

Reviewing files that changed from the base of the PR and between 1a1c3d4 and fcb9c2e.

📒 Files selected for processing (2)

internal/terminal/app.go
internal/terminal/render_internal_test.go

💤 Files with no reviewable changes (1)

internal/terminal/app.go

🚧 Files skipped from review as they are similar to previous changes (1)

internal/terminal/render_internal_test.go

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📝 Summary

Summary by CodeRabbit

Bug Fixes
- Prevented duplicate rendering during terminal startup.
- Subsequent redraws occur only when the interface has changes, reducing unnecessary refreshes.
- Extension tick events continue to be delivered during eligible frame updates.
Tests
- Added coverage confirming clean interfaces skip redraws while changed interfaces redraw and emit frame tick events.

Walkthrough

The terminal loop no longer performs a duplicate startup draw. It starts clean and schedules frame ticks only while dirty. Frame ticks emit extension events. Tests cover clean and dirty frame-tick behavior.

Changes

Terminal frame scheduling

Layer / File(s)	Summary
Loop state and frame scheduling `internal/terminal/app.go`	The loop initializes `dirty` to false, schedules frame ticks only when dirty, emits extension tick events on frame ticks, and removes obsolete draw helpers.
Frame tick behavior and coverage `internal/terminal/render_internal_test.go`	Tests verify that clean state skips redraws and dirty state redraws after the frame ticker while updating the `tick_events` buffer.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to fcb9c

This change makes the terminal only redraw frames when something actually changed, which should reduce unnecessary rendering work without altering visible behavior. Inspection of the scheduling logic and its tests found no correctness or reliability issues, so this appears safe to merge.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided. The changeset is understandable from the title and file summary, but the description check cannot confirm author-provided context.	Add a concise description that states the terminal loop now renders only dirty frames and identifies the related test coverage.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: terminal rendering now occurs only for dirty frames.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Commit unit tests in branch perf/terminal-render-loop

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Actionable comments posted: 2

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Inline comments:
In `@internal/terminal/app.go`:
- Around line 483-487: Remove the initial app.draw(ctx) call in app.loop before
the dirty initialization and runLoopStep loop; retain the draw performed by
drawFirstFrameAndLoadInitialTasks so startup renders only once before event
processing.

In `@internal/terminal/render_internal_test.go`:
- Around line 869-880: Add focused coverage around App.runLoopStep for a dirty
frame: trigger the dirty state, consume the frame tick from frameTick, then
assert the "tick" extension event and the resulting terminal output from
app.draw(ctx). Keep the existing TestFrameTickOnlyRunsForDirtyState behavior
unchanged.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 01c95ec8-5c79-4298-80ea-a912e34aa623

📥 Commits

Reviewing files that changed from the base of the PR and between fbf5f5b and 1a1c3d4.

📒 Files selected for processing (2)

internal/terminal/app.go
internal/terminal/render_internal_test.go

Included review availability: 9 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 10 reviews per hour.

sonarqubecloud · 2026-09-13T05:12:08Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

codecov · 2026-09-13T05:23:05Z

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.17%. Comparing base (fbf5f5b) to head (fcb9c2e).

Files with missing lines	Patch %	Lines
internal/terminal/app.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
+ Coverage   88.13%   88.17%   +0.03%     
==========================================
  Files         361      361              
  Lines       34636    34629       -7     
==========================================
+ Hits        30527    30533       +6     
+ Misses       4104     4091      -13     
  Partials        5        5

Flag	Coverage Δ
unittests	`88.17% <66.66%> (+0.03%)`	⬆️

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perf(terminal): render only dirty frames

1a1c3d4

coderabbitai Bot requested changes Sep 13, 2026

View reviewed changes

Comment thread internal/terminal/app.go Outdated

Comment thread internal/terminal/render_internal_test.go

fix(terminal): address render loop review

fcb9c2e

coderabbitai Bot approved these changes Sep 13, 2026

View reviewed changes

omarluq merged commit 42d89d0 into main Sep 13, 2026
13 checks passed

omarluq deleted the perf/terminal-render-loop branch September 13, 2026 05:32

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perf(terminal): render only dirty frames - #351

perf(terminal): render only dirty frames#351
omarluq merged 2 commits into
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perf/terminal-render-loop

omarluq commented Sep 13, 2026

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sonarqubecloud Bot commented Sep 13, 2026

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coderabbitai Bot commented Sep 13, 2026 •

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